"Ancre" les répertoires d'entrée et de sortie dans le dossier des sources.

Pour qu'on puisse utilise le "build" depuis un autre gulpfile.

gulpfile.esm.js

@@ -10,18 +10,19 @@ import terser from "gulp-terser";
 
 sass.compiler = sass_compiler;
 
+const SRC = __dirname + "/src";
+const DEST = __dirname + "/public";
 const UPSTREAM = "node_modules/reveal.js";
-const DEST = "public";
 
 const src = (globs, opts = {}) =>
-  _src(globs, { cwd: __dirname, base: "src/", ...opts });
-const upstream = (globs, opts = {}) => src(globs, { base: UPSTREAM, ...opts });
-const dest = (target, opts = {}) => _dest(target, { cwd: __dirname, ...opts });
+  _src(globs, { base: SRC, ...opts });
+const upstream = (globs, opts = {}) => _src(globs, { base: UPSTREAM, ...opts });
+const dest = (target, opts = {}) => _dest(target, { base: DEST, ...opts });
 
-export const clean = () => del(`public/**`);
+export const clean = () => del(`${DEST}/**`, { force: true });
 
 export const misc = () =>
-  src([`src/**/*.{eot,otf,ttf,woff,woff2,json,html}`, `src/**/LICENSE`])
+  src([`${SRC}/**/*.{eot,otf,ttf,woff,woff2,json,html}`, `${SRC}/**/LICENSE`])
     .pipe(
       upstream([
         `${UPSTREAM}/**/*.{eot,otf,ttf,woff,woff2,json,html}`,
@@ -33,7 +34,7 @@ export const misc = () =>
     .pipe(dest(DEST));
 
 export const stylesheets = () =>
-  src(`src/**/*.css`)
+  src(`${SRC}/**/*.css`)
     .pipe(
       upstream([
         `${UPSTREAM}/**/*.css`,
@@ -47,7 +48,7 @@ export const stylesheets = () =>
     .pipe(dest(DEST));
 
 export const images = () =>
-  src(`src/**/*.{png,svg,gif,ico,jpg,jpeg}`)
+  src(`${SRC}/**/*.{png,svg,gif,ico,jpg,jpeg}`)
     .pipe(
       upstream([
         `${UPSTREAM}/**/*.{png,svg,gif,ico,jpg,jpeg}`,
@@ -58,7 +59,7 @@ export const images = () =>
     .pipe(dest(DEST));
 
 export const themes = () =>
-  src(`src/css/theme/source/**/*.scss`, { base: "src/css/theme/source" })
+  src(`${SRC}/css/theme/source/**/*.scss`, { base: `${SRC}/css/theme/source` })
     .pipe(
       upstream(`${UPSTREAM}/css/theme/source/**/*.scss`, {
         base: `${UPSTREAM}/css/theme/source`,
@@ -75,7 +76,7 @@ export const themes = () =>
     .pipe(dest(`${DEST}/css/theme`));
 
 export const code = () =>
-  src([`src/**/*.js`])
+  src([`${SRC}/**/*.js`])
     .pipe(
       upstream([
         `${UPSTREAM}/**/*.js`,